<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [BSW] External HDMI monitor suddenly shows solid color when playing Youtube video at 1080p [fifo underrun]" href="https://bugs.freedesktop.org/show_bug.cgi?id=97965#c32">Comment # 32</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [BSW] External HDMI monitor suddenly shows solid color when playing Youtube video at 1080p [fifo underrun]" href="https://bugs.freedesktop.org/show_bug.cgi?id=97965">bug 97965</a> from <a class="email" href="mailto:ykku16dev2@gmail.com" title="Yu Kang Ku <ykku16dev2@gmail.com>"> Yu Kang Ku</a> <pre>(In reply to Ville Syrjala from <a href="show_bug.cgi?id=97965#c31">comment #31</a>) > Actually bits 31:22 look fairly interesting here. But perhaps start > experimenting with bits 6:0 a bit instead, since that's what we do on VLV as > well. I experimented with bits 6:0, but all of my experiments failed. The following are the 5 different values I tried: 1. val |= 3000 / 250; /* This is what VLV is using */ 2. val |= 0x16; /* This is what you see on your BSW */ 3. val &= ~0x7f; /* This is the minimum value just for sanity */ 4. val |= 0x1; /* Another sanity check */ 5. val |= 0x7f; /* This is the maximum value */ So, I've covered the normal values, as well as the extreme ones. After every failure, I used intel_reg to verify that the B-unit register contained the correct value. I then came across a BIOS setting on the BSW RVP that can disable dynamic self refresh altogether. So, I disabled it, but I can still reproduce the problem. Since it looks like self-refresh isn't a factor here, I did not bother with bits 31:22.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> </ul> </body> </html>