To add to my latest comment where I report that problem reappeared a few times in recent days: same hardware, same usage pattern, on the very re- installation of 16.04 that had the problem disappear (cf. #comment:77). Software updates applied regularly since the last near-2-years. Nothing salient would explain that, besides maybe a regression that came with a software update?
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1547077 Title: Suspend to ram causes some glyphs to draw consistently wrong or even appear blank in gtk/gdk/pango/cairo apps. xterm/xmessage unaffected. Status in xorg package in Ubuntu: Triaged Bug description: # Summary * Some glyphs badly drawn at some moments. * When happens, same glyph drawn on various windows shows same corruption. * Problem comes and go. Cannot use nvidia proprietary driver as a workaround (does not work at all). # Context Laptop, using "intel" (or "nouveau" ?) driver. Expected: all glyphs rendered correctly. Observed: some glyphs not rendered correctly * reproducible: sometimes, eventually. Problem comes and go, severity varies from one glyph (see 2016y02m17d_18h08m27s_0100Z_x_bug_glyph_firefox_gnome_org.png ) to all text on screen fully unreadable (see 2016y02m10d_18h42m18s_0100Z_wow_screen_flickers_and_most_glyphs_wrong_01.png ) * *some* glyphs are affected. For example, letter 'a' of a certain size will be replaced by colored garbage at many places where it appears (see 2016y02m18d_16h05m35s_0100Z_same_corruption_on_different_windows.png ), but other 'a' with different size, italic, bold, etc will be unaffected. * in some applications (e.g. xfce whisker menu), some glyphs are rendered correctly or not depending on the direction of mouse hovering. See video 2016y02m16d_21h41m14s_0100Z_whisker_menu_missing_glyphs.mp4 . * in menu of gtk application, some glyphs are "fixed" by opening the menu, but not all. For example, in xfce4-terminal, letter A of "Affichage" and its menu content as well as "Aide" is affected. Opening "Affichage" menu does not fix anything. Opening "Aide" menu fixes the "A" of "Aide". Changing window size reactivates the bug on "A" or "Aide". See video 2016y02m18d_16h14m25s_0100Z_glyph-redrawn- bug.mp4 . * text under icons on desktop is affected, but shadows are not. See 2016y02m16d_21h32m11s_0100Z_x_bug_reenabling_antialias_reactivates_problem_shadow_unaffected.png # Affected applications * xfce whisker menu, * xfce4-terminal (nealy all screenshots) * firefox (see 2016y02m17d_18h08m27s_0100Z_x_bug_glyph_firefox_gnome_org.png 2016y02m16d_21h32m11s_0100Z_x_bug_reenabling_antialias_reactivates_problem_shadow_unaffected.png ), * thunderbird (see 2016y02m16d_21h28m35s_0100Z_x_bug_affects_thunderbird_terminal.png ), * emacs (see 2016y02m10d_18h41m49s_0100Z_wow_screen_flickers_and_most_glyphs_wrong_00.png and subsequent ), * superswitcher ( a gtk/gdk app) * *NOT* affected: xterm, xmessage. Perhaps only gtk/gdk/pango/cairo apps are affected. # Additional information This looks like a cache corruption somewhere. On IRC #pango, someone suggested a bug in Intel driver. Running `xfce4-appearance-settings` and there changing any of: * antialiasing enable/disable, * hinting strength, * subpixel alignment * or dpi immediately cures the bug (see 2016y02m16d_21h31m52s_0100Z_x_bug_disabling_antialias_immediately_cures_problem.png ) Setting back the exact same parameters immediately reactivates the bug (see 2016y02m16d_21h32m11s_0100Z_x_bug_reenabling_antialias_reactivates_problem_shadow_unaffected.png). It is believed that keeping any new settings for a while will have the bug reoccur. It is not like bug 1536751. That one affects rendering quality of *all* glyphs, at all times, depending on dpi. This is not the case here: *some* glyphs (randomly chosen) are drawn corrupted (replaced by garbage or absent), not always. --- ApportVersion: 2.20-0ubuntu3 Architecture: amd64 CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: None CurrentDesktop: XFCE DistUpgraded: Fresh install DistroCodename: xenial DistroRelease: Ubuntu 16.04 DistroVariant: ubuntu DkmsStatus: virtualbox, 5.0.14, 4.4.0-8-generic, x86_64: installed ExtraDebuggingInterest: Yes, including running git bisection searches GraphicsCard: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if 00 [VGA controller]) Subsystem: ASUSTeK Computer Inc. 4th Gen Core Processor Integrated Graphics Controller [1043:177d] Subsystem: ASUSTeK Computer Inc. GM107M [GeForce GTX 850M] [1043:177d] InstallationDate: Installed on 2016-02-03 (26 days ago) InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160203) MachineType: ASUSTeK COMPUTER INC. N551JK Package: xorg 1:7.7+13ubuntu1 PackageArchitecture: amd64 ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-7-generic.efi.signed root=UUID=1a4f1bb3-67a8-4e9e-ba71-e9a2741c04a8 ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 4.4.0-7.22-generic 4.4.2 Tags: xenial ubuntu regression reproducible has-workaround Uname: Linux 4.4.0-7-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 10/06/2014 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: N551JK.203 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: N551JK dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: 1.0 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: ASUSTeK COMPUTER INC. dmi.chassis.version: 1.0 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrN551JK.203:bd10/06/2014:svnASUSTeKCOMPUTERINC.:pnN551JK:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnN551JK:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0: dmi.product.name: N551JK dmi.product.version: 1.0 dmi.sys.vendor: ASUSTeK COMPUTER INC. version.compiz: compiz N/A version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.67-1 version.libgl1-mesa-dri: libgl1-mesa-dri 11.1.2-1ubuntu1 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 11.1.2-1ubuntu1 version.xserver-xorg-core: xserver-xorg-core 2:1.17.3-2ubuntu4 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.6.1-1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20160218-1ubuntu2 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1547077/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
