search for: vgacon

fbcon makes the (reasonable) assumption that it only needs to program the hardware once, when fbcon_init() is called for the foreground console. This doesn't always play well with vgacon because vgacon_deinit() is only doing its job when the last console it owns is closed (in most cases, that is *after* fbcon_init() has set the new mode). Depending on the hardware this can cause the wrong framebuffer location to be scanned out (e.g. reproduced on nv05 with the nouveau framebuffer d...

Problem: qxl switches from native mode back into vga compatibility mode when it notices someone is accessing vga registers. And vgacon does exactly that before fbcon takes over. Before qxl switched to the generic fbdev emulation that didn't cause any problems. With the generic fbdev emulation the switch to vga mode happens now and then, probably caused by a initialization order change and triggered by a printk in a bad momen...

Problem: qxl switches from native mode back into vga compatibility mode when it notices someone is accessing vga registers. And vgacon does exactly that before fbcon takes over. Before qxl switched to the generic fbdev emulation that didn't cause any problems. With the generic fbdev emulation the switch to vga mode happens now and then, probably caused by a initialization order change and triggered by a printk in a bad momen...

Hi, The much easier fix is this one ;) cheers, Gerd -- = Gerd Hoffmann <kraxel@suse.de> -------------- next part -------------- --- drivers/video/console/vgacon.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) Index: paravirt-2.6.20-hg749/drivers/video/console/vgacon.c =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3...

Hi, The much easier fix is this one ;) cheers, Gerd -- = Gerd Hoffmann <kraxel@suse.de> -------------- next part -------------- --- drivers/video/console/vgacon.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) Index: paravirt-2.6.20-hg749/drivers/video/console/vgacon.c =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3...

On Wed, Feb 20, 2019 at 03:36:40PM +0100, Gerd Hoffmann wrote: > Problem: qxl switches from native mode back into vga compatibility mode > when it notices someone is accessing vga registers. And vgacon does > exactly that before fbcon takes over. > > Before qxl switched to the generic fbdev emulation that didn't cause any > problems. With the generic fbdev emulation the switch to vga mode > happens now and then, probably caused by a initialization order change > and trigge...

Problem: qxl switches from native mode back into vga compatibility mode when it notices someone is accessing vga registers. And vgacon does exactly that before fbcon takes over. So make sure we kick out vgacon early enough that it wouldn't disturb us. Signed-off-by: Gerd Hoffmann <kraxel at redhat.com> --- drivers/gpu/drm/qxl/qxl_drv.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/qxl/qxl_drv.c b...

Problem: qxl switches from native mode back into vga compatibility mode when it notices someone is accessing vga registers. And vgacon does exactly that before fbcon takes over. So make sure we kick out vgacon early enough that it wouldn't disturb us. Signed-off-by: Gerd Hoffmann <kraxel at redhat.com> --- drivers/gpu/drm/qxl/qxl_drv.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/qxl/qxl_drv.c b...

On Thu, Feb 21, 2019 at 01:20:11PM +0100, Daniel Vetter wrote: > On Thu, Feb 21, 2019 at 12:35:34PM +0100, Gerd Hoffmann wrote: > > Problem: qxl switches from native mode back into vga compatibility mode > > when it notices someone is accessing vga registers. And vgacon does > > exactly that before fbcon takes over. So make sure we kick out vgacon > > early enough that it wouldn't disturb us. > > > > Signed-off-by: Gerd Hoffmann <kraxel at redhat.com> > > --- > > drivers/gpu/drm/qxl/qxl_drv.c | 1 + > > 1 file...

There's a short window between module load and fbcon initalization when it's possible for vgacon to write to VGA RAM. Nouveau uses this memory for different purposes, so if we are unlucky, it causes mysterious memory corruptions. For me, booting with nv_printk debug levels set to 5 was enough to trigger it. It manifested as long stream of: "trapped write at ... on channel 0x0001fea0 BAR/...

On Thu, Feb 21, 2019 at 12:35:34PM +0100, Gerd Hoffmann wrote: > Problem: qxl switches from native mode back into vga compatibility mode > when it notices someone is accessing vga registers. And vgacon does > exactly that before fbcon takes over. So make sure we kick out vgacon > early enough that it wouldn't disturb us. > > Signed-off-by: Gerd Hoffmann <kraxel at redhat.com> > --- > drivers/gpu/drm/qxl/qxl_drv.c | 1 + > 1 file changed, 1 insertion(+) > >...

Hi, > I was thinking of checking whether pdev is a VGA class device and whether > it decodes vga access, and in that case automatically calling How can I figure that? Ok, class is easy, but decode? pci.h offers functions to set vga decode but not to get that info ... thanks, Gerd

On Thu, Feb 21, 2019 at 4:11 PM Gerd Hoffmann <kraxel at redhat.com> wrote: > > Hi, > > > I was thinking of checking whether pdev is a VGA class device and whether > > it decodes vga access, and in that case automatically calling > > How can I figure that? Ok, class is easy, but decode? pci.h offers > functions to set vga decode but not to get that info ...

Hi, > I was thinking of checking whether pdev is a VGA class device and whether > it decodes vga access, and in that case automatically calling How can I figure that? Ok, class is easy, but decode? pci.h offers functions to set vga decode but not to get that info ... thanks, Gerd

...tup-xen.c 2007-08-07 10:40:43.000000000 +0200 +++ head-2007-08-07/arch/i386/kernel/setup-xen.c 2007-08-09 12:21:12.000000000 +0200 @@ -1669,23 +1669,12 @@ void __init setup_arch(char **cmdline_p) bootloader_type = LOADER_TYPE; if (is_initial_xendomain()) { - /* This is drawn from a dump from vgacon:startup in - * standard Linux. */ - screen_info.orig_video_mode = 3; - screen_info.orig_video_isVGA = 1; - screen_info.orig_video_lines = 25; - screen_info.orig_video_cols = 80; - screen_info.orig_video_ega_bx = 3; - screen_info.orig_video_points = 16; - screen_info.orig_y = screen_info.o...

...l from kernel.org to fix the ACPI wont shutdown issue, but I have a couple errors in dmesg I am trying to figure out. Can anyone point me in the right direction? The errors are: 1: dm_mod: module verification failed: signature and/or required key missing - tainting kernel 2: [drm] VGACON disable radeon kernel modesetting. [drm:radeon_init] *ERROR* No UMS support in radeon module!

...see if dcb entries are calculated correctly - they were. 9) At this point my S/R counter reached ~40, so I started to wonder how to debug it without actually doing S/R. So I came up with an idea of booting with NvForcePost=1. With all debugging messages reaching console I hit what turned out to be vgacon/Nouveau memory corruption bug... Facepalm. I fixed it 2 days later (patch posted yesterday), but... I still couldn't reproduce original issue without suspending. 10) And then... I noticed in resume log that GPIO init is the very first thing Nouveau does on resume. Moving GPIO init after POST fi...

...reg, @@ -1306,6 +1315,11 @@ static int __devinit vga16fb_probe(struct platform_device *dev) ret = -ENOMEM; goto err_fb_alloc; } + info->apertures = alloc_apertures(1); + if (!info->apertures) { + ret = -ENOMEM; + goto err_ioremap; + } /* XXX share VGA_FB_PHYS and I/O region with vgacon and others */ info->screen_base = (void __iomem *)VGA_MAP_MEM(VGA_FB_PHYS, 0); @@ -1335,7 +1349,7 @@ static int __devinit vga16fb_probe(struct platform_device *dev) info->fix = vga16fb_fix; /* supports rectangles with widths of multiples of 8 */ info->pixmap.blit_x = 1 << 7 |...

...74,12 @@ CONFIG_RCU_FANOUT set to non-default value of 32 RCU dyntick-idle grace-period acceleration is enabled. NR_IRQS:4352 nr_irqs:744 16 -Console: colour VGA+ 80x25 +Console: colour dummy device 80x25 I believe GRUB does something to the videocard so that drivers/video/console/vgacon.c passes control to drivers/video/console/dummycon.c and that somehow confuses nouveau and makes it map multiple BARs in one call. Ironically, GRUB uses text mode on that system. Perhaps it cannot enable the GFX mode. Yet it must be doing something bad when passing control to the kernel. I'...

We don't want vga16fb to mess with hardware initialized by other driver. Detect it and refuse to load. It fixes nouveau interrupt storm on some machines. Signed-off-by: Marcin Slusarz <marcin.slusarz at gmail.com> --- drivers/video/vga16fb.c | 13 ++++++++++++- 1 files changed, 12 insertions(+), 1 deletions(-) diff --git a/drivers/video/vga16fb.c b/drivers/video/vga16fb.c index