Steam's Big Picture Mode has a number of triangle-shaped artifacts, glitches, and problems. Buttons blank, sometimes pictures get covered in half by white triangles (as if z-fighting with something white) and also an intermittent, semi-periodic triangle shaped glitch across the whole screen.
And a note: it was doing this before, and the newest update (Steam downloaded said update not more than 5 minutes ago, so the most recent update) has actually made the problem worse. The large screen-filling glitch comes much more often.Here are some screenshots[imgur.com]
of the three problems described, as an imgur album.
Speed: 1601 Mhz
4 logical processors
2 physical processors
Operating System Version:
Ubuntu 12.10 (64 bit)
Kernel Name: Linux
Kernel Version: 3.5.0-19-generic
X Server vendor: The X.Org Foundation
X Server release: 11300000
Driver: Intel Open Source Technology Center Mesa DRI Intel(R) Sandybridge Mobile x86/MMX/SSE2
Driver Version: 3.0 Mesa 9.0
Desktop Color Depth: 24 bits per pixel
Monitor Refresh Rate: 60 Hz
Number of Monitors: 1
Number of Logical Video Cards: 1
Primary Display Resolution: 1366 x 768
Desktop Resolution: 1366 x 768
Primary Display Size: 11.54" x 6.46" (13.19" diag)
29.3cm x 16.4cm (33.5cm diag)
Primary VRAM Not Detected
Audio device: Intel CougarPoint HDMI
RAM: 3806 Mb
UI Language: English
Microphone: Not set
Total Hard Disk Space Available: 115656 Mb
Largest Free Hard Disk Block: 54933 Mb
Recent Failure Reports:
Sat Dec 8 00:05:37 2012 GMT: file ''/tmp/dumps/assert_20121207190535_1.dmp'', upload yes: ''CrashID=bp-8e796b7e-a1f5-49c9-82ad-2850b2121207''
Sat Dec 8 00:43:26 2012 GMT: file ''/tmp/dumps/assert_20121207194317_1.dmp'', upload yes: ''CrashID=bp-d1d3d053-a84c-4f55-b8ca-7b3492121207''
Sat Dec 8 00:53:37 2012 GMT: file ''/tmp/dumps/assert_20121207195334_1.dmp'', upload yes: ''CrashID=bp-1006cc26-bb20-4b07-a844-7f8b32121207''