Sony G520 CRT snaps on mode switch

Felix Miata mrmazda at
Fri Dec 5 11:27:59 PST 2014

Alex Deucher composed on 2014-12-05 10:06 (UTC-0500):

> Felix Miata wrote:

>> I have an rv516 card:

>> In as many different machines and with as many different Linux distros and
>> versions I've tried this with (always FOSS X drivers, and IIRC, all with KMS
>> kernels), I don't think there are any that don't ever exhibit $SUBJECT. I do
>> a lot of switching between KDE3 & 4 and the vttys, so this is annoying, and
>> makes me wonder if it could be damaging the CRT for this to happen.

>> The "snapping" manifests different to different extents. Sometimes the screen
>> just goes black then redraws. Other times in addition, the going black is
>> accompanied by an audible snap noise. A mode switch (aka to or from KDE and a
>> vtty) isn't required, but can be induced by running the attached script that
>> includes xrdb and xrandr commands.

>> Last booted was openSUSE 13.1, server, radeon driver
>> xf86-video-ati-7.2.0-2.4.1, libdrm_radeon1-2.4.46-3.2.2 from which I got no
>> snapping sound.

>> Does this sound like a software issue, or hardware? If software, kernel, or X
>> driver?

> It's pretty common with CRTs and is a normal part of the mode switch process:


I know about that.


I sent without realizing my story left out key points. The click sounds like
it normally does when being awakened from sleep mode, except distinctly
*louder*. And, I use this CRT with many different video cards, none of which
that I can remember switch *loudly* like the rv516 *sometimes* does: mga400,
i810, i845, i865, i915, i945, iG31, iG43, nv r11, nv r84, rv200, rv250,
rv370, rv380, Cedar, XGI Z7/Z9 & others. The rv516's loud switches are
accompanied by a very brief flash of bright white only at the top of the
screen. My other cards don't cause that.
"The wise are known for their understanding, and pleasant
words are persuasive." Proverbs 16:21 (New Living Translation)

 Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata  ***

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