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List:       fedora-test-list
Subject:    Re: comment to F23 Final RC10 - still card reader problem
From:       Richard Ryniker <ryniker () alum ! mit ! edu>
Date:       2015-10-31 15:34:45
Message-ID: E1ZsYB3-0007pm-FE () ryniker ! org
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I think you may be the victim of GNOME's "Do what you maybe probably
want." attitude.  This is something you might be able to configure to
your taste, given sufficient knowledge about what specifications to
change.

I have a Lenovo machine with a Realtec card reader:

[ryniker@lenovo ~]$ lspci | grep Card
02:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5209 PCI Express \
Card Reader (rev 01)

This is known as /dev/mmcblk0, and when I insert a SD card with file
systems on a couple of partitions:

[root@lenovo ryniker]# blkid | grep mmc
/dev/mmcblk0: PTUUID="ba2edfb9" PTTYPE="dos"
/dev/mmcblk0p1: SEC_TYPE="msdos" LABEL="boot" UUID="74BD-74CF" TYPE="vfat" \
                PARTUUID="ba2edfb9-01"
/dev/mmcblk0p2: UUID="ec2aa3d2-eee7-454e-8260-d145df5ddcba" TYPE="ext4" \
PARTUUID="ba2edfb9-02"

GNOME kindly mounts these under /run/media:

[ryniker@lenovo ~]$ mount | grep mmc
/dev/mmcblk0p1 on /run/media/ryniker/boot type vfat \
(rw,nosuid,nodev,relatime,uid=501,gid=501,fmask=0022,dmask=0022,codepage=437,iocharset=ascii,shortname=mixed,showexec,utf8,flush,errors=remount-ro,uhelper=udisks2)
                
/dev/mmcblk0p2 on /run/media/ryniker/ec2aa3d2-eee7-454e-8260-d145df5ddcba type ext4 \
(rw,nosuid,nodev,relatime,seclabel,data=ordered,uhelper=udisks2)

which I find sometimes helpful, sometimes not.  In any case, these are
"user" mounts.  I have not explored what happens when multiple users are
logged in when a card is loaded.  If I do not want these file systems
mounted, I can:

[ryniker@lenovo ~]$ umount /dev/mmcblk0p1
[ryniker@lenovo ~]$ umount /dev/mmcblk0p2

and then remove the SD card when umount completes (this may take a while
if a lot of data must be flushed to the media).

Often, I want to write a new image onto a SD card (dd of=/dev/mmcblk0).
If I do not first umount these automatically-mounted file systems, dd
output is buffered in memory - dd may report a transfer rate of one
gigabyte per second - and I am exceedingly careful to wait until I
observe activity to the SD card has ended before I remove it (without any
umount operations, which I fear may corrupt the image I just wrote.)

The automatic behavior may be right for most users.  I have enough
experience to (usually) avoid the pits, and recognize what has gone wrong
when I stumble into one.

This Lenovo machine also has a reboot problem similar to one you
reported.  Windows reboots successfully, but Fedora does not.  Fedora
shuts down, I see the Lenovo splash screen, but no boot.  I must force
power off, then wait through a ten-second "Power Saving" countdown
displayed on-screen before actual power off, then I can boot
successfully.  Peculiarity of the Lenovo hardware, I suppose, and I just
live with it.
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