User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:33.0) Gecko/20100101 Firefox/33.0 Build ID: 20141013200257 Steps to reproduce: I use Firefox (currently version 33) with Ubuntu 14.04 on a MacBook Air5,2 with Intel HD Graphics 4000 chipset. I use rEFInd to boot into Linux. I plug in an external Dell 22" LCD monitor over mini DisplayPort -> DVI. It's rotated 90 degrees clockwise. I run a second Firefox window, Gnome terminal, and occasionally other windows on this external monitor. Actual results: Sporadic display glitches on the external monitor. Every few days I'll start seeing sparse black checkerboard across it, or shifted colors, or the monitor blanks for a few seconds. But this *only* happens if there's a Firefox window on the external display. If I minimize this Firefox window or drag it to my built-in display, then the external display is rock-solid. Expected results: It could be a linux driver problem, could be hardware, could be a problem with compiz or unity, ... But since Firefox is the proximate cause of corruption I'm filing it here. I don't see any report of display problems in /var/log/Xorg.0.log or `dmesg`. I'm running stock kernel except for a Broadcom Wi-Fi module, and Intel's display driver intel(0): SNA compiled: xserver-xorg-video-intel 2:2.99.910-0ubuntu1.3 (Timo Aaltonen <firstname.lastname@example.org>) Firefox's about:support "Graphics" section says Adapter Description Intel Open Source Technology Center -- Mesa DRI Intel(R) Ivybridge Mobile Device ID Mesa DRI Intel(R) Ivybridge Mobile Driver Version 3.0 Mesa 10.1.3 GPU Accelerated Windows 0/3 Basic Vendor ID Intel Open Source Technology Center WebGL Renderer Intel Open Source Technology Center -- Mesa DRI Intel(R) Ivybridge Mobile windowLayerManagerRemote false AzureCanvasBackend cairo AzureContentBackend cairo AzureFallbackCanvasBackend none AzureSkiaAccelerated 0 I see no overridden settings for display or graphics in about:config. I know Firefox blacklists and whitelists certain graphics chips and drivers. There's no mention of HD 4000 or Ivybridge in https://wiki.mozilla.org/Blocklisting/Blocked_Graphics_Drivers
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