Comment # 12 on bug 1189826 from Javier Llorente

diff -ur flickering non-flickering
diff -ur flickering/i915_display_info.txt non-flickering/i915_display_info.txt
--- flickering/i915_display_info.txt    2021-08-27 10:13:32.287997379 +0200
+++ non-flickering/i915_display_info.txt        2021-08-27 10:15:19.547997042
+0200
@@ -18,7 +18,7 @@
                uapi: [FB:0] n/a,0x0,0x0,, visible=hidden,
src=0.000000x0.000000+0.000000+0.000000, dst=0x0+0+0, rotation=0 (0x00000001)
        [PLANE:63:cursor A]: type=CUR
                uapi: [FB:0] n/a,0x0,0x0,, visible=hidden,
src=0.000000x0.000000+0.000000+0.000000, dst=0x0+0+0, rotation=0 (0x00000001)
-       underrun reporting: cpu=no pch=yes
+       underrun reporting: cpu=yes pch=yes
 [CRTC:104:pipe B]:
        uapi: enable=no, active=no, mode="": 0 0 0 0 0 0 0 0 0 0 0x0 0x0
        [PLANE:68:plane 1B]: type=PRI
diff -ur flickering/i915_gpu_info.txt non-flickering/i915_gpu_info.txt
--- flickering/i915_gpu_info.txt        2021-08-27 10:13:32.283997379 +0200
+++ non-flickering/i915_gpu_info.txt    2021-08-27 10:15:19.543997042 +0200
@@ -1,11 +1,11 @@
 Kernel: 5.13.12-1-default x86_64
 Driver: 20201103
-Time: 1630052012 s 286150 us
-Boottime: 85 s 358062 us
-Uptime: 80 s 606314 us
-Capture: 4294913599 jiffies; 0 ms ago
+Time: 1630052119 s 550568 us
+Boottime: 192 s 622481 us
+Uptime: 94 s 79911 us
+Capture: 4294938714 jiffies; 0 ms ago
 Reset count: 0
-Suspend count: 0
+Suspend count: 1
 Platform: GEMINILAKE
 Subplatform: 0x0
 PCI ID: 0x3185
@@ -60,7 +60,7 @@
   fence[31] = 00000000
 ERROR: 0x00000000
 DONE_REG: 0x07ffffff
-FAULT_TLB_DATA: 0x00000019 0xc4453d63
+FAULT_TLB_DATA: 0x00000011 0xc4613de3
 GTT_CACHE_EN: 0xf0007fff
 GuC firmware: 
        status: DISABLED
@@ -154,7 +154,7 @@
   VSYNC: 00000000
 CPU transcoder: EDP
   Power: on
-  CONF: c0000024
+  CONF: c0000000
   HTOTAL: 081f077f
   HBLANK: 081f077f
   HSYNC: 07cf07af