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We just need to clear the SBA and ENABLE bits to reset the AGP controller: If the AGP bridge was configured to use "fast writes", clearing the FW bit would break the subsequent MMIO writes and eventually end with a lockup. Note that all the BIOSes I've seen do the same as we did (it works for them because they don't use MMIO), OTOH the blob leaves FW untouched. Signed-off-by:

https://bugs.freedesktop.org/show_bug.cgi?id=36422 Summary: unable to hibernate with nouveau and NV11 [bisected] Product: xorg Version: unspecified Platform: All OS/Version: Linux (All) Status: NEW Severity: normal Priority: medium Component: Driver/nouveau AssignedTo: nouveau at