Comment # 23
on bug 102646
from Ruben Harutyunyan
Hello! I am having a similar (same?) issue on my RX580 (Asus STRIX TOC). Seems to be an issue with MCLK switching. Here is a video of it happening on the desktop: https://www.youtube.com/edit?o=U&video_id=z28fFqNdjAY (there is also screen flickering that's not seen on camera, but it doesn't happen too often in contrary to the horizontal lines) OBS is unable to campture the glitches though: https://www.youtube.com/edit?o=U&video_id=iMEnprhBKFQ Notes: 1) Most of the time glitches happen when something new gets rendered. 2) Google Chrome/Chromium always glitch (to a lesser extent when only the start page is open and nothing changes on the screen, opening Facebook guarantees glitches). 3) Playing video in VLC doesn't cause any glitches (x264 encoded MKV). 4) It's really easy to reproduce by setting the power profile to low (which fixes the issue) and then switching to high while looking at the screen. The glitch will occur for a split second. Switching from high to low also causes the issue. Workarounds so far: 1) Recompiling the kernel with "smu7_vblank_too_short" forced to output true (aka disabling MCLK switching) fixes the problem but locks the MCLK at 2Ghz and causes coil whine and higher temps. 2) Setting the power profile to anything but "auto". 3) Disabling DC. It's also worth noting that in my case "low" power profile works fine, but R9 390x users seem to need "high" power profile to fix it (from the "smu7_vblank_too_short" thread: https://bugs.freedesktop.org/show_bug.cgi?id=96868#c32). I can test any patches/programs/cases if you need it.
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