On Wed, Jan 19, 2022 at 12:08:39PM +0100, Helge Deller wrote: > This reverts commit 39aead8373b3c20bb5965c024dfb51a94e526151. > > Revert this patch. This patch started to introduce the regression that > all hardware acceleration of more than 35 existing fbdev drivers were > bypassed and thus fbcon console output for those was dramatically slowed > down by factor of 10 and more. > > Reverting this commit has no impact on DRM, since none of the DRM drivers are > tagged with the acceleration flags FBINFO_HWACCEL_COPYAREA, > FBINFO_HWACCEL_FILLRECT or others. > > Signed-off-by: Helge Deller <deller@xxxxxx> > Cc: stable@xxxxxxxxxxxxxxx # v5.16 Why just 5.16? This commit came in on 5.11 and was backported to 5.10.5. As for "why", I think there was a number of private bugs that were reported in this code, which is why it was removed. I do not think it can be safely added back in without addressing them first. Let me go dig through my email to see if I can find them... thanks, greg k-h
