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<b><a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - [KBLR] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun"
href="https://bugs.freedesktop.org/show_bug.cgi?id=104168#c4">Comment # 4</a>
on <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - [KBLR] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun"
href="https://bugs.freedesktop.org/show_bug.cgi?id=104168">bug 104168</a>
from <span class="vcard"><a class="email" href="mailto:mapengyu@gmail.com" title="Pengyu.Ma <mapengyu@gmail.com>"> <span class="fn">Pengyu.Ma</span></a>
</span></b>
<pre>It can be reproduced on new Thinkpad X1 Carbon 6th:
logs:
Jan 17 13:44:20 u-ThinkPad-X1-Carbon-6th kernel: [ 4460.254635] i915
0000:00:02.0: HDMI-A-1: EDID is invalid:
Jan 17 13:44:20 u-ThinkPad-X1-Carbon-6th kernel: [ 4460.254638] [00]
BAD 00 ff ff ff ff ff ff 00 ff ff ff ff ff ff ff ff
Jan 17 13:44:20 u-ThinkPad-X1-Carbon-6th kernel: [ 4460.254639] [00]
BAD ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
Jan 17 13:44:20 u-ThinkPad-X1-Carbon-6th kernel: [ 4460.254640] [00]
BAD ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
Jan 17 13:44:20 u-ThinkPad-X1-Carbon-6th kernel: [ 4460.254641] [00]
BAD ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
Jan 17 13:44:20 u-ThinkPad-X1-Carbon-6th kernel: [ 4460.254641] [00]
BAD ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
Jan 17 13:44:20 u-ThinkPad-X1-Carbon-6th kernel: [ 4460.254642] [00]
BAD ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
Jan 17 13:44:20 u-ThinkPad-X1-Carbon-6th kernel: [ 4460.254643] [00]
BAD ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
Jan 17 13:44:20 u-ThinkPad-X1-Carbon-6th kernel: [ 4460.254644] [00]
BAD ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
Jan 17 13:44:56 u-ThinkPad-X1-Carbon-6th kernel: [ 4495.691252] do_trap: 14
callbacks suppressed
Jan 17 13:44:56 u-ThinkPad-X1-Carbon-6th kernel: [ 4495.691257] traps:
unity-settings-[2867] trap int3 ip:7fd2c6d9da5b sp:7fff492b5b80 error:0 in
libglib-2.0.so.0.4800.2[7fd2c6d4d000+10f000]
Jan 17 13:46:08 u-ThinkPad-X1-Carbon-6th kernel: [ 4568.235116] traps:
unity-settings-[7346] trap int3 ip:7f8e278a3a5b sp:7fffbe71cd80 error:0 in
libglib-2.0.so.0.4800.2[7f8e27853000+10f000]
Jan 17 13:46:47 u-ThinkPad-X1-Carbon-6th kernel: [ 4607.021203] [drm] Reducing
the compressed framebuffer size. This may lead to less power savings than a
non-reduced-size. Try to increase stolen memory size if available in BIOS.
Jan 17 13:47:00 u-ThinkPad-X1-Carbon-6th kernel: [ 4619.928434] traps:
unity-settings-[7403] trap int3 ip:7f5411004a5b sp:7ffcf4570a90 error:0 in
libglib-2.0.so.0.4800.2[7f5410fb4000+10f000]
Jan 17 13:47:05 u-ThinkPad-X1-Carbon-6th kernel: [ 4624.969103] [drm] Reducing
the compressed framebuffer size. This may lead to less power savings than a
non-reduced-size. Try to increase stolen memory size if available in BIOS.
Jan 17 13:47:10 u-ThinkPad-X1-Carbon-6th kernel: [ 4629.640154] traps:
unity-settings-[7455] trap int3 ip:7ff901cc5a5b sp:7fff43917760 error:0 in
libglib-2.0.so.0.4800.2[7ff901c75000+10f000]
Jan 17 13:47:30 u-ThinkPad-X1-Carbon-6th kernel: [ 4650.078915] [drm] Reducing
the compressed framebuffer size. This may lead to less power savings than a
non-reduced-size. Try to increase stolen memory size if available in BIOS.
Jan 17 13:47:31 u-ThinkPad-X1-Carbon-6th kernel: [ 4651.111816]
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO
underrun
Jan 17 13:47:31 u-ThinkPad-X1-Carbon-6th kernel: [ 4651.111883]
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO
underrun
Jan 17 13:47:40 u-ThinkPad-X1-Carbon-6th kernel: [ 4659.497593] traps:
unity-settings-[7468] trap int3 ip:7f793380ea5b sp:7ffcf09d49f0 error:0 in
libglib-2.0.so.0.4800.2[7f79337be000+10f000]</pre>
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