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After some effort, can't change grub screen resolution

I want to change grub screen resolution.

Four facts:

(1) "vbeinfo" and "videoinfo" return no result in grub.  The screen blanks and eventually I restart the computer.

(2) "hwinfo --framebuffer" returns no result.  I would append the logfile, but it's 7500 lines long.

(3) running

lspci  -v -s  $(lspci | grep ' VGA ' | cut -d" " -f 1)

00:02.0 VGA compatible controller: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Integrated Graphics Controller (rev 35) (prog-if 00 [VGA controller])
Subsystem: ASRock Incorporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Integrated Graphics Controller
Flags: bus master, fast devsel, latency 0, IRQ 121
Memory at 90000000 (64-bit, non-prefetchable) [size=16M]
Memory at 80000000 (64-bit, prefetchable) [size=256M]
I/O ports at f000 [size=64]
[virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
Capabilities: [d0] Power Management version 2
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [b0] Vendor Specific Information: Len=07 <?>
Kernel driver in use: i915
Kernel modules: i915

(4) So far, changing GRUB_GFXMODE (in /etc/default/grub) to several of the resolutions I know my monitor supports (and then running "sudo update-grub") has no effect.

Any suggestions?

I've been running sid for a year, but this has been a problem since I got the computer a couple of years ago and was running stable so I figure it's not sid-specific.

Lance Simmons