<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [BYT] No picture on DSI display after DRM loads on Teclast X80H tablet" href="https://bugs.freedesktop.org/show_bug.cgi?id=96996#c1">Comment # 1</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [BYT] No picture on DSI display after DRM loads on Teclast X80H tablet" href="https://bugs.freedesktop.org/show_bug.cgi?id=96996">bug 96996</a> from <a class="email" href="mailto:laszlo.fiat@gmail.com" title="Laszlo Fiat <laszlo.fiat@gmail.com>"> Laszlo Fiat</a> <pre>I've had this bug open as <a class="bz_bug_link bz_status_RESOLVED bz_closed" title="RESOLVED DUPLICATE - [BYT] Blank screen on DSI display after drm loads on Teclast X80h tablet" href="show_bug.cgi?id=93799">BUG 93799</a>, then I added it as a duplicate of BUG 90469, which is the same issue on a different hardware, but that bug was tested on its original hardware, and got closed. As I wrote in <a class="bz_bug_link bz_status_CLOSED bz_closed" title="CLOSED WORKSFORME - [BYT dsi] WARNING: CPU: 3 PID: 265 at drivers/gpu/drm/drm_irq.c:1130 drm_wait_one_vblank+0x177/0x180()" href="show_bug.cgi?id=90469#c51">BUG 90469 Comment 51</a>, the kernels between linux-next-20151012 to linux-next-20151119 actually worked, there were some red or purple screen for a second, but then the DSI display worked properly. I found out that for later kernels I needed to add i915.fastboot=1 to have the display working, like 4.6.0-rc4. But something went wrong again, because it doesn't work even with i915.fastboot=1 with newer kernels (I first detected this on 20160517 with intel-drm-nightly) With kernels, where the DSI display doesn't work, there are warnings in the dmesg. In the latest dmesg I get: [ 8.592431] WARNING: CPU: 3 PID: 59 at drivers/gpu/drm/i915/intel_display.c:13590 intel_atomic_commit_tail+0x104b/0x1050 [i915] [ 8.592435] pipe A vblank wait timed out</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>