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A kernel error is requesting me to upgrade my HP Probook 4540s UEFI.
The error involves the i915 graphics driver. On another laptop, the
one on which I coded simple-netaid, i915 failed to turn on the
backlight for a whole year. However, at that time I found a workaround
using a kernel parameter. I wish I find another kernel parameter that
prevents the current error. Since DNG is read by many who may have
used kernel parameters to override sloppy firmware implementations, I
am posting here for some help.

The kernel "complains" as follows:
[    7.471266] [drm] Wrong MCH_SSKPD value: 0x16040307
[    7.471269] [drm] This can cause pipe underruns and display issues.
[    7.471270] [drm] Please upgrade your BIOS to fix this.
[    7.489912] fbcon: inteldrmfb (fb0) is primary device
[    7.598128] EFI Variables Facility v0.08 2004-May-17
[    7.724203] hp_accel: laptop model unknown, using default axes configuration
[    7.729494] jmb38x_ms 0000:02:00.3: enabling device (0000 -> 0002)
[    7.757025] [drm:ilk_display_irq_handler] *ERROR* Pipe A FIFO underrun
[    7.759849] [drm:cpt_set_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder A
[    7.759851] [drm:cpt_serr_int_handler] *ERROR* PCH transcoder A FIFO underrun


If you can't explain it simply, you don't understand it well enough.

Albert Einstein
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