Em Qua, 2016-06-08 às 22:35 +0100, Steven Honeyman escreveu: > Hi, Hi CC'ing the mailing list. > > With commit a98ee79317b4091cafb502b4ffdbbbe1335e298c to enable FBC by > default, I get a strange issue with screen update/refresh (sorry if > my > terminology is off - I'm not a graphics dev!). > Here's how it went (all in the past few hours): > > Kernel 4.5.5 (before the patch) - everything OK. > Kernel 4.6.2 - In a terminal window (openbox+roxterm or tilda, if > that > matters), the screen only updated approx 1 or 2 times per second when > typing (e.g. hold a key and they appear in chunks of 15-20!). Holding > a key and moving the mouse, appears fine. > Kernel 4.6.1 - (same as 4.6.2, but I had to try) > Kernel 4.7-rc2 - Same refresh/update problem, but this time moving > the > mouse had no effect. > Spent 5 mins googling, found your patch, applied i915.enable_fbc=0 > and > 4.7-rc2 behaves as it should. > > So in response to your suggestions for debugging this made in the > commit message, I swapped out the boot parameter for drm.debug=0xe, > but apart from the stuff at startup I got nothing extra after > reproducing the problem. > Your suggestions make it sound like you might expect something > 'major' > to go wrong, infrequently... however this is always apparent, and > (fairly) minor. > > Hardware is a Dell E6540, Haswell i5 with Intel graphics. FHD eDP > panel + external FHD DVI screen. > Please let me know if there's any other info you want. Please boot with i915.enable_fbc=1 drm.debug=0xe, reproduce the problem and check if there is any dmesg line mentioning "FIFO underruns". Also, which distro version are you using? Are you using xf86-video- intel? Maybe also grab /var/log/Xorg.0.log. Perhaps it would be better if you open a bug on bugs.freedesktop.org, attach the relevant information, and provide me the link to the bug report. It's better to track bugs there. Anyway, I should submit a patch reverting FBC on stable Kernels. Thanks, Paulo > > > Thanks, > Steven _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
