[Bug 287928] Kobo eReader fails to attach

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 30 Jun 2025 16:57:04 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287928

            Bug ID: 287928
           Summary: Kobo eReader fails to attach
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: emaste@freebsd.org

Kobo eReader fails to connect, kernel at
1d8f8f3e36fafdb50613d042f5fa75d8cbcf2b8f, Kobo firmware 4.38.23171 (6b370fffff,
10/29/24). Log shows a "CACHE PAGE TOO SHORT" followed by it disconnecting:

Jun 30 12:49:23 framework kernel: [155962.255688] ugen1.2: <Kobo
eReader-4.38.23171> at usbus1
Jun 30 12:49:23 framework kernel: [155962.255965] umass0 on uhub0
Jun 30 12:49:23 framework kernel: [155962.256000] umass0: <Kobo
eReader-4.38.23171, class 0/0, rev 2.00/1.10, addr 11> on usbus1
Jun 30 12:49:23 framework kernel: [155962.256052] umass0:  SCSI over Bulk-Only; 
quirks = 0x0
Jun 30 12:49:23 framework kernel: [155962.256589] umass0:1:0: Attached to
scbus1
Jun 30 12:49:23 framework kernel: [155962.268778] da0 at umass-sim0 bus 0
scbus1 target 0 lun 0
Jun 30 12:49:23 framework kernel: da0: <Kobo eReader-4.38.231 0110> Removable
Direct Access SCSI-2 device
Jun 30 12:49:23 framework kernel: da0: 40.000MB/s transfers
Jun 30 12:49:23 framework kernel: da0: 6903MB (14139389 512 byte sectors)
Jun 30 12:49:23 framework kernel: da0: quirks=0x2<NO_6_BYTE>
Jun 30 12:49:23 framework kernel: [155962.270761] (da0:umass-sim0:0:0:0): CACHE
PAGE TOO SHORT data len 15 desc len 0
Jun 30 12:49:23 framework kernel: [155962.270786] (da0:umass-sim0:0:0:0): Mode
page 8 missing, disabling SYNCHRONIZE CACHE
Jun 30 12:49:24 framework kernel: [155963.047874] ugen1.2: <Kobo
eReader-4.38.23171> at usbus1 (disconnected)
Jun 30 12:49:24 framework kernel: [155963.047947] umass0: at uhub0, port 4,
addr 11 (disconnected)
Jun 30 12:49:24 framework kernel: [155963.052334] da0 at umass-sim0 bus 0
scbus1 target 0 lun 0
Jun 30 12:49:24 framework kernel: da0: <Kobo eReader-4.38.231 0110>  detached
Jun 30 12:49:24 framework kernel: [155963.053971] (da0:umass-sim0:0:0:0):
Periph destroyed
Jun 30 12:49:24 framework kernel: [155963.054048] umass0: detached

This has worked in the past (with -CURRENT from several years ago) but the Kobo
firmware has also updated since then.

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