On 9 June 2016 at 15:49, Zanoni, Paulo R <paulo.r.zanoni@xxxxxxxxx> wrote: > 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. Thanks - done: https://bugs.freedesktop.org/show_bug.cgi?id=96464 > > 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
